Document Type : Original Article
Authors
1
Department of Geomorphology, Faculty of Planning and Environmental Sciences, University of Tabriz
2
Dept of Geomorphology, Faculty of Planning and environmental sciences, University of Tabriz
Abstract
Landslide is one of the destructive hazards that causes much damage to residential zones and natural resources such as forests and farmlands every year. This phenomenon is noticeable in Iran because most of the areas in this country are mountainous, especially in the northern parts. This study determined susceptible zones with landslide incidence potential in the Mehran Roud basin, located in the northwestern part of Iran. For achieving this aim, the information layers related to 8 factors that are effective in landslide incidence, including Geology, land use, slope, aspect, elevation classes, precipitation, distance to stream, and distance to fault, were prepared under the ArcGIS platform. Then, rating the factors was done using the analytic network process (ANP) method in the Super Decisions software. The study results showed that the weights of the mentioned eight factors are 0.331, 0.080, 0.117, 0.036, 0.055, 0.233, 0.112, and 0.032, respectively. Finally, landslide susceptibility zonation map was obtained by integrating weighted layers in GIS software. The zonation map divides the basin in terms of landslide occurrence into five classes, including very high susceptibility (21 km2), high (134 km2), moderate susceptibility (94 km2), low (60 km2), and very low susceptibility (51 km2), which high susceptibility areas cover the largest area of the basin. A comparison between the zonation map and the scattered landslide points obtained from field activities shows that 85.7% of the landslides have occurred in high and very high susceptibility zones.
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